I went to NCT classes, read millions of books, was totally addicted to the iVillage forums and spent every day reading them. (Then MN but I only found that later).
There wasn't really parenting social media then, but there were lots of forums :) TBH I don't rate a lot of the social media on parenting - it's gone a bit weird and overly polarised. There was always some of this (breast vs bottle, sleep train vs don't) but it's gone totally bonkers. Especially platforms which are short-form and primarily want to show you stuff via an algorithm, rather than what you've chosen. Tiktok, Twitter, Instagram - and single issue FB groups are all a bit nuts and should be treated with caution.
Longer form content is good - podcasts, books. What I do now is scan someone's FB or instagram page to get a sense of their voice, style, and info and then from there decide whether to look at their book or podcast. But I don't follow parenting content on instagram because it becomes very stressful - it's the constant bam, bam, bam, bam, all these tiny snippets of advice become overwhelming and impossible to process, let alone follow which just leads to a vague sense of guilt, doom and inadequacy. Whereas reading a book gives you time to think about and digest the info which means you might actually be able to use it - or at least make a reasoned sense of nah, that isn't for me.
Real life connections are great - antenatal classes, bumps-and-babies type meet ups, breastfeeding support groups, stay and play, buggy fit, sling meet, baby sensory/baby massage (the activity doesn't matter very much, it's for you to meet other mums). Keep in touch with your friend :) And online groups based around something other than a single issue. MN due month threads, local FB mum groups, Reddit "bumper" clubs. These can be great and supportive.
Take so much with a pinch of salt. Remember it's only been really recently that we've even had access to so many millions of different opinions. In general if anyone tells you something is extremely important, check this with a reputable organisation like NHS or WHO or RoSPA or Lullaby Trust. If they don't consider it to be of extreme importance, it's likely really not! And I liked the rule of thumb that says to ask yourself: Did my grandmother worry about this? If she didn't, then it's probably not that serious.
Amy Brown is brilliant and sensible, I would expect this to be full of great stuff:
https://www.amazon.co.uk/Lets-Talk-About-First-Parenting/dp/1780667108
Also I give this to all new mums :) https://www.amazon.co.uk/What-Mothers-Do-especially-nothing-ebook/dp/B0087GZIRO/
Also, remember you don't have to learn it all at once. For example you said about grapes, but newborns don't eat grapes. By the time you get to giving them solid foods, you'll have all kinds of information marketed to you - your health visitor will probably offer a talk, Boots give out free guides written by the baby food companies, there are books, there are clues on stuff like packaging (e.g. items sold "from 6 months") and you'll hopefully know some other parents at about the same stage. Someone would tell you about grapes, for sure. And even if they didn't, it's not like every time a toddler eats a whole grape they instantly choke to death. The majority of the time they are absolutely fine. And this is true for most things. Babies typically survive their parents' mistakes, you can get away with making a few - everyone does. If you find yourself in constant fear that one tiny slip up is going to terribly harm or endanger your baby, that is a sign of postnatal anxiety and you should speak to your GP (and consider stepping away from the internet).
For a newborn you only really have to work out milk feeding, dressing/temperature regulation, nappies, sleep safety, bathing, and transporting them around/making sure they can't roll off things. There are laws about using a car seat. Everything else is nice-to-have fluff, and not essential.
Most products come with manuals (even if the baby doesn't!), you can ask for support with feeding, dressing, bathing in hospital, or from your midwife/HV when she visits you at home after the birth.
You should be given information about sleep safety and when to call a midwife/doctor.
There is a brilliant app I would recommend to all new parents called "Baby Check App" (By NHS and Lullaby Trust) which you go through any time they are ill and it will pick up any warning signs of serious illness and tell you whether to treat at home, see the GP, call 111 or go to A&E.
It all comes one issue at a time. Don't stress. We are all learning as we go along.